I think this Buffalo nickel is in AU details, but it had a lot of PVC damage on it so I decided to see what acetone could do to it. It came out of a 3 for $1 bin so there's almost no risk involved. Here's the coin before (pictures are kinda crap): And here's the coin after: The light hits it a weird way in the after photos, but thankfully I don't see signs of cleaning or anything else that would detract from its value. I think the final result is about an AU-55, which bids at $11 compared to $2 in XF, which is what I'd sell the AU details coin for. I'm always up for turning a $2 coin into an $11 coin. Now I just gotta sell it.
Looks like most of the green gunk came off, cool. I was always too scared to try this myself, but certainly a ~33 cent cost basis for an experiment is hardly any risk.
It's taken a while for me to try it, mainly because I wanted to test if acetone was really harmless on coins; after testing it on a 1925-D in hopes of removing the corrosion, it didn't help but fortunately it did nothing bad to the coin. So far, all my results with it have been satisfactory. Thank ya! I know I'll try this again if I come across bargain bin Buffaloes with the same damage.